CN108621567A - Method for carrying out printing process in ink-jet printer - Google Patents
Method for carrying out printing process in ink-jet printer Download PDFInfo
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- CN108621567A CN108621567A CN201810236009.0A CN201810236009A CN108621567A CN 108621567 A CN108621567 A CN 108621567A CN 201810236009 A CN201810236009 A CN 201810236009A CN 108621567 A CN108621567 A CN 108621567A
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- color
- test pattern
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- ink
- mesh point
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00071—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for characterised by the action taken
- H04N1/00082—Adjusting or controlling
- H04N1/00087—Setting or calibrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1218—Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources
- G06F3/1219—Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources with regard to consumables, e.g. ink, toner, paper
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00007—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to particular apparatus or devices
- H04N1/00023—Colour systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00031—Testing, i.e. determining the result of a trial
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/605—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis for controlling ink amount, strike-through, bleeding soakage or the like
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6002—Corrections within particular colour systems
- H04N1/6008—Corrections within particular colour systems with primary colour signals, e.g. RGB or CMY(K)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6041—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis for controlling uniformity of color across image area
Abstract
Method for carrying out printing process in ink-jet printer by computer is by color notation conversion space between targeted colorspace and process color space,For calibrating inkjet printing machine,Suitable for the test pattern of printing process in the process color space with the limitation depending on printing process applying in color be printed and with colour measurement method in targeted colorspace be measured,Generated measured value is corresponding to the mesh point in the targeted colorspace of measurement,It is pushed away in being carried out between the mesh point and determines other mesh point,Color notation conversion space is carried out by the mesh point in targeted colorspace and the input value known to test pattern in process color space,Input value is corresponding to the mesh point in targeted colorspace,For the physics size for directly using droplet volume depending on the limitation of printing process in applying in color and for the input value in process color space,The calibration of ink-jet printer is adjusted and carries out printing process.
Description
Technical field
The present invention relates to it is a kind of by means of about droplet volume direct color control in ink-jet printer into
The method of row printing process.
The present invention is in digital printing technologies field.
Background technology
It uses the working method known to traditional hectographic printing mostly in ink jet printing at present and uses there
Test pattern.Select a following test pattern, the test pattern that there is test zone, the test zone to have herein
For the process color of the printing process to be carried out in printing machine, different from each other combination, usually i.e. CMYK and optionally one
A to multiple additional color, and the coverage values with the covering of different such as 10,20,30 to 100% color.When following mistakes
When the most different combinations of Cheng Yanse are printed, the most different combinations of the process color are produced as can be by used printing
The color in targeted colorspace of machine printing.That is, process color, i.e. CMYK used in printing machine and can
The color space of the special color of energy is known as process color space, and CIELAB color spaces are known as targeted colorspace mostly.This by
Particular job method in color management obtains.Here, digitally existing printing image slices pass through in most cases
First color notation conversion space is transformed into standardized color space, the digitally existing printing by means of input characteristics file
Image slices should be generated by the printing process of machine and are present in RGB color.The color space is commonly referred to as
XYZ color space.The special characteristic of the color space is the CIELAB color spaces of specific criteria, hereinafter referred to as
LAB color spaces.It can accurately be described by means of the profile connecting space, the printing image to be generated should be in printing figure
Where picture is upper to have for which color value.That is, LAB color spaces are targeted colorspace in this respect.However
The color printing in LAB color spaces cannot be used due to printing machine, but uses CMYK process colors and special color, so in face
Other color notation conversion space is needed in colour tube reason, so that determination can utilize which kind of color of CMYK and optional additional color
Required LAB color spaces are realized in combination.It is so-called to be generated thus by means of printing and measurement by already described test pattern
Output characteristics file carries out the color notation conversion space from targeted colorspace to process color space.Then the test is carried out
The printing and measurement of pattern, wherein this is carried out by means of color measuring device, and the color measuring device is measured in color of object
The color value realized in space.Here, the measured value or measurement point of color measuring device are corresponding to the determination in targeted colorspace
Mesh point.The mesh point then can be based on the test pattern with mesh point corresponding with each combination of process color
Systematization is arranged and is dispensed in process color space.It is possible thereby to carry out from targeted colorspace to process color space
Color notation conversion space.It as a result, can be by original in RGB face by means of the input characteristics file and output characteristics file that so generate
Digitally existing target print image is generated by the intermediate steps of the transformation in targeted colorspace to mistake in the colour space
In journey color space and printing machine is made correspondingly to be characterized in the range of color management.
Here, in traditional hectographic printing, the limitation that the color to printing image applies is mostly by maximum allowable
Gross area coverage rate, i.e. Total Area Coverage-TAC are provided.The maximum allowable gross area coverage rate indicates to use
Print color, such as C, M, Y, the maximum allowable percentage value summation of K etc..TAC values consider the so-called of printed pages
" drying " characteristic.The dry oxidation process for referring to ink mostly in this case either falls (wegschlagen) or ink
To the infiltration in paper.Thus it prevents, the printed pages in stacking stick together, too strong deform or ink is wiped out.
In ink jet printing, when using water-soluble ink, drying meets the literal meaning.Hard by ultraviolet
Importantly, the ultraviolet used can also make ink fully hardened in the ink of change.Anyway, per unit area is applied to
The quantity of ink (such as unit of each pixel picoliters) as ink volume on printable fabric is important herein.It is different from
Hectographic printing, ink is not on printable fabric in constant thickness in the case of ink jet printing, to printable fabric
Relevant area covering it is simple assessment be not main purpose.
When will common percentage value use is in ink-jet system in hectographic printing when, then be in percentage value TAC values
The scheduled limitation of form is generally not suitable for actual process characteristic.The percentage value is especially by corresponding single
The maximum value of the permission of each color share in channel, the calibration that also referred to as the ink limit carries out influence, for example, by with
The calibration that the target of scheduled variable density curve carries out is influenced to influence by mesh.
09 007 657 B2 of american documentation literature US disclose described problem a kind of in two color spaces
The method for carrying out color notation conversion space, wherein determine so-called " excess values, the excess " for blend color, connect
It and is in addition calculated as area covering value and then in the case of direct usable floor area coverage values using empty for color
Between the approximate solution that converts.The disclosed method produces suitable test pattern herein, however the test pattern also includes
" cannot print " color region, and the part of required color space is uncovered simultaneously.Color notation conversion space is in addition non-
It is carried out in linear color space.Without directly reflecting the calibration of physical conditions and printing machine used in not accounting for.This
Outside, it can not achieve the specific limit of ink.
Therefore the prior art lacks the generation test pattern for color management and that ink jet printing matches, and
Common use to the physics size of droplet volume.The calibration that the optimal and ink jet printing of ink-jet printer matches exists
Also not known in the prior art.
Invention content
Therefore, task of the invention lies in, realize a kind of color management for ink-jet printer method, the method
Optimally match with the particular requirement of ink jet printing.
The task passes through the targeted colorspace and process color according to the present invention for by means of being carried out by computer
Color notation conversion space between space and the method for printing process is carried out in ink-jet printer to solve, wherein in order to calibrate
Ink-jet printer, suitable for the test pattern of printing process with applying in color depend on printing process be limited in process
It is printed in color space and with measured in targeted colorspace, the measured value phase so generated with colour measurement method
Mesh points of the Ying Yu in measured targeted colorspace is pushed away in progress between the mesh point and is thereby determined that in addition
Mesh point, and by means of in targeted colorspace mesh point and in process color space as known to test pattern
Input value carry out color notation conversion space, the input value is corresponding to mesh point in targeted colorspace, and the side
Method is characterized in that, in applying in color depending on the limitation of printing process and for defeated in process color space
Enter the physics size that value directly uses droplet volume, the calibration of ink-jet printer adjusts and as follows to printed
Journey.
According to the method for the present invention based on the basic process by color management known in the art, the color management
Basic process matches with the particular demands of ink jet printing in the method according to the invention.In order to now can be with foreseeable
Mode application inkjet printing process meets purpose, and printing machine does not utilize traditional percentage value to control, and directly utilizes
Ink bulking value (i.e. for example as unit of each pixel picoliters) controls.It is possible that being simulated by computer assisted software
Or by being weighed by quantity of ink in the form of measure monochromatic color grade to determine for each Color Channel with each picture
Plain picoliters are the relationship between the input value and output valve of unit.By using the corresponding inverse function to input value, under acquisition
The print system stated, the print system accurately export the input value as unit of each pixel picoliters.It is not important to herein,
Whether work with specific machine data or with traditional percentage value inside printing machine, i.e., to the system based on ink volume
Conversion anyway can be in a very simplified manner by realizing one-dimensional correction function use in each Color Channel.
The calibration that the inside of printing process carries out also only changes the form of the correction function, and when the calibration is not to avoid pole
When strong modified curve is contributed, the theoretically calibration can be also removed.
When indicating image with common format, such as PDF or TIFF, the specific color value of device (such as CMYK etc.) can be with
It is construed to completely and the relevant value of volume.It can be required in the 8bit binary codings the case where, each Color Channel is made
With a suitable scaling factor, maximum value (255) is allocated to corresponding as unit of picoliters/pixel by the scaling factor
Maximum value.The factor then for example labeled as the specific record in PDF data and can be realized and efficiently use number
It is worth range.
Certainly only following image based on volume explains that described image is related to the specific face of device of ink jet process
The colour space.By client mostly as original input data, the image that is detached for standard hectographic printing as usual
Reason.
The method advantageous and thus preferred further scheme are by affiliated dependent claims and by having
There is the explanation of affiliated attached drawing to obtain.
One preferred further scheme is herein, and targeted colorspace is Lab color spaces, and process color space
It is CMYK color space or includes process color space of the CMYK color space as subset.In most cases, target face
The colour space is LAB color spaces, and process color space is CMYK color space and possible special color.It is described possible special
Color corresponds to the CMYK color space that the special color used extends standard.Such as CMYKOGV substitutes CMYK, wherein OGV is indicated
Orange, green, purple.However there is also the other form of targeted colorspace, it is empty that the form is typically based on XYZ colors
Between, wherein LAB color spaces are only the standardized and very common universal representative of XYZ color space.
One other preferred further scheme is herein, in calibrating inkjet printing machine, the face for each using
The mesh point of chrominance channel is visually evenly distributedly calculated and the computer assisted color notation conversion space life based on progress
The alignment features curve is used at alignment features curve and for the printing process of ink-jet printer.Calibration steps includes mainly
The printing of test pattern measures and by equally distributed mesh point is calculated.When printing and measuring test pattern, accordingly
Mesh point is generated in the placement of measurement point.Task in color management is evenly distributedly to place mesh point as far as possible, from
And the color notation conversion space so carried out as far as possible equably includes all areas of the two color spaces.In this way may be used
To realize in the following way, correspondingly place measurement point, i.e. measurable test pattern position.However because of that generate
Mesh point is insufficient to for carrying out color notation conversion space, so interior release lacks usually between two already present mesh points
Mesh point.The method places that measurement point is coordinated with each other in this way in order to generate mesh point for the first time, so that the net generated
Lattice point evenly distributedly generates as far as possible.Alignment features curve, institute are generated by means of the equally distributed mesh point so generated
Stating alignment features curve can be such that the control computer of ink-jet printer realizes, by definitely accurately being reached using process color
To the color value in targeted colorspace, the color value is needed for current printing image.
One other preferred further scheme is that the mesh point of each Color Channel is uniformly distributed by borrowing herein
At least two scheduled curve processings for helping have the input value of the predistortion of each Color Channel are in process color space
Input value based on ink droplet realize, wherein an input with corresponding predistortion is printed for each scheduled curve
The test pattern of value and then use with generate optimal measured value test pattern be used as be suitable for color notation conversion space
Test pattern.In order to will be used to generate the equally distributed mesh point in each Color Channel cost keep it is as small as possible and
It is proposed, will as unit of each pixel picoliters existing input value digitally predistortion.The predistortion generates used mistake
The larger change width of Cheng Yanse combinations, thus this is generated corresponding to the mesh point in process color space in target
The large bandwidth of the value of generation in color space, thus this causes significantly to change mesh point.With corresponding process color value
The curve of the predistortion of combination is then adopted to the combination of the process color in test pattern, and the curve of the predistortion is then to survey
Either mesh point generates the measured value or mesh point then in the desired color value in targeted colorspace to magnitude
On.
One other preferred further scheme is herein, and when making input value be distorted, the distortion is for all
Color Channel carries out independently of one another, pre- to each of described at least two scheduled curves firstly for a Color Channel
Fixed curve prints a test pattern with the correspondingly input value of predistortion, then by computer for other face
It is that all remaining combinations of the input value of chrominance channel analog predistortion and thus use generate, with all colours channel
The suitable test pattern of optimal test zone is used for colour switching.For all Color Channels in simplest example
Use identical curve.However, to make predetermined curve be distorted all Color Channels independently of one another, then for
At least four all Color Channels printed in the form of test pattern inevitably a myriad of Color Channel combination be
Inefficient.5 are not only printed simply instead of then due to the mutual independence in channel herein and multiply page 4, correspondingly print 54
Page.It is not the institute that different predistortions is printed for each Color Channel to reduce the test pattern page of such excessive amount
Possible combination, but all predistortions for a Color Channel are printed only once.Then by means of computer
Analog result is come for the combination with other Color Channel.Then new test pattern is generated based on the result, it is described
New test pattern contains the combination being most preferably distorted in each Color Channel.
One other preferred further scheme is herein, iteratively along in the target of multidimensional and process color space
One-dimensional axis determine that the mesh point of each Color Channel is uniformly distributed, be achieved in the test zone of suitable test pattern
Multidimensional be uniformly distributed.Because striving for reaching being uniformly distributed for each Color Channel in color sky for made every effort to mesh point
Between in be also multidimensional, which can be made of more than three dimension, so advantageously, being carried out along one-dimensional axis
Mesh point being uniformly distributed on the axis, the one-dimensional axis along the relevant Color Channel by color space phase
Color is answered to show.If this carries out all Color Channels, corresponds in process color space and thus also exist
Mesh point in targeted colorspace realizes being uniformly distributed for the multidimensional of the test zone in test pattern.
One other preferred further scheme is to depend on being limited in for printing process in color application herein
It is determined in the range of characterization, wherein by the limitation of droplet volume to maximum color application value by means of the drying about ink
The physics predetermined value of characteristic carries out, and thus generates the conditional test zone of tool, suitable, modified test pattern,
The test pattern also includes only the test zone that can be printed in process color space by ink-jet printer, at the test zone
Within maximum color application value.It is characterized in the range of according to the method for the present invention, it is intended that corresponding to spray
The condition adjustment of ink print process will be used for the test pattern of colour switching.Here, emphasis is to calculate maximum droplet volume, it is described
Maximum droplet volume is obtained by the drying property of physics predetermined value, such as ink.By means of the maximum value of droplet volume
Test pattern can be correspondingly adjusted, more precisely, being adjusted in the form of following, i.e., is limited each test zone of test pattern
Make the maximum value of droplet volume.That is, thus test pattern also includes only following test zones, the test zone
Within maximum color application value in generation.Then, it is carried out by means of the test pattern of the conditional test zone of tool
The corresponding of mesh point measures and calculates and thus carry out color notation conversion space.
One other preferred further scheme is herein, in order to generate the conditional color space of tool it is suitable,
The test pattern of modification, the test zone other than maximum color application value are modified to maximum color application value, are not printed
Brush is printed and is then ignored.If the test pattern calibrated still also has more than maximum color application value
The test zone is then modified to maximum color application value by test zone.A kind of other possibility is, the test zone not by
It prints and the region blank or the test zone is made to be printed simultaneously with excessively high color application value, i.e. excessively high droplet volume
And it is then ignored when generating the mesh point for color notation conversion space.
One other preferred further scheme is by means of the mesh point determined and to have conditional test herein
Region, suitable, modified test pattern is generated for the face between targeted colorspace and process color space
The ICC characteristic files of color space transformation are to carry out printing process.For the output characteristics file needed for color management in most feelings
It is so-called ICC characteristic files in condition.In the method according to the invention, herein in the suitable test pattern progress with generation
In the range of characterization, the test pattern is then changed corresponding to maximum color application value, the suitable test of the modification
Pattern correspondingly printed, measured and based on the mesh point that so generates generate it is for color notation conversion space, be in ICC characteristics
The output characteristics file of document form.The ICC characteristic files are then used to the color management of ink-jet printer.
One other preferred further scheme is that the calibration is distributed about to the mesh point in test pattern herein
Calculating reversibly carry out, wherein by the measurement data of the calibration directly consider test pattern test zone distribution
In.It is obtained in distribution by the test zone that the measurement data of the calibration is directly referred to test pattern for characteristic text
The optimal mesh point that part calculates.It is possible thereby to generate the characteristic file based on volume on the machine calibrated based on volume.
The case where scheduled curve for using the input value with predistortion, suitable to this is the curve group for calculating SCTV,
In, SCTV refers to spot colour tone value, i.e. spot color site tone value.
Description of the drawings
Below with reference to affiliated attached drawing by means of at least one preferred embodiment explain in detail the present invention itself and
In the structure of the present invention and/functionally advantageous further scheme.In the accompanying drawings, each corresponding element is respectively equipped with identical
Reference numeral.
Attached drawing is shown：
Fig. 1：One example of the structure of page ink-jet printer
Fig. 2：Exemplary flow according to the method for the present invention
Fig. 3：One example of the curve of multiple predistortions of the input value as unit of pL/P
Fig. 4：The schematic flow diagram of calibration
Fig. 5：The schematic flow diagram of characterization
Fig. 6：Calculate the schematic flow diagram of droplet volume
Fig. 7：Limit the schematic flow diagram of droplet volume
Fig. 8：Determine the schematic flow diagram of color position distribution
Specific implementation mode
The preferred application field for implementing variant is ink-jet printer 7.The basic structure of the machine 7 is shown in FIG. 1
An example, the machine includes the institute for printed substrate 2 to be transported to the continuous glassware 1 of printing equipment 4 until discharger 3
Printed substrate is stated to be printed by print head 5 in the printing equipment.The machine is ink-jet page printer 7, the spray herein
Black page printer is controlled by control computer 6.
Basic schematical flow according to the method for the present invention is shown in FIG. 2.Here, the method includes four
Sub-step.Used ink-jet printer 7 is calibrated first.This process is described in detail in Fig. 4.The calibration is with life
Terminate at the alignment features curve of printing machine 7.
One other important sub-step is back to back characterization, and adjustment is for colour switching in the characterization
Required test pattern.This process is described in detail in Figure 5.The most emphasis of the characterization is to calculate corresponding ink droplet body
Product, also referred to as ink volume, the calculating schematically illustrates in figure 6, and according to physics predetermined value by calculated ink droplet
Volumetric constraint is to maximum value.This is schematically illustrated in the figure 7.
Then, next sub-steps according to the method for the present invention are to determine that color position is distributed, the color position point
The calibration value and supplementary characteristic that cloth amendment generates in calibration range.The step is illustrated with its each flow in fig. 8.
Then, in last sub-step that the ICC characteristic files 11 so generated is empty for color according to the present invention
Between transformation to carry out and the matched color management of inkjet printing process.
Other preferred implementation variant is hereinafter also described now.
There is the test pattern of a series of determination, for example according to ISO 12647-2 (or IT8.7/ for hectographic printing
Or 2002 test patterns of ECI 4).The test pattern includes a large amount of colour gamut, and it is being single with percentage that the colour gamut, which has,
The combination of print color in the different classifications of position.Most of which test pattern does not include the limit that maximum total color applies
System.Using, the limitation to be followed after violating can be tolerated, when the limitation only in several colour gamuts generate and this
When a little colour gamuts do not constitute associated face.
It is that the classification of color channel values is derived from practice and lead to usefully scanning process space in common use,
Also when the classification of the color channel values is optimal usually compared with other all situations.The latter is for example imprinted on comparing
Become apparent when painting the test pattern on the paper with non-japanning.
Relevant with noticeable consuming in hectographic printing is the debugging of generation and machine 7 mainly due to printing plate
Time causes larger test pattern to be printed with changing with a variety of in succession.However this is not problem in the case of ink jet printing；
Machine 7 need not be made to stop again thus.
Being equally spaced also the case where being printed by the system based on ink volume in the single channel of test pattern
In the general particularly advantageous scanning not provided to process space.However not only exist from time cost but also from cost
This is very efficiently not print single test pattern, print a series of changes at once.Here, especially can be with
The used input value as unit of 10 picoliters 9 of each pixel is set to be come by means of scheduled curve in its corresponding region pre-
Distortion, the input value are between 0 and the maximum value of permission each channel.5 are exemplarily illustrated in figure 3 to be used for
The curve 8 of predistortion.
The change of the series can be realized by PDF data with multipage in a simple manner.When the test pattern of printing
Such as with the step-length of maximum value 10% include each Color Channel in color change curve when, then can be a series of different
Suitable distribution is directly given in distortion by visual determination.Realize in this way scanning to process space at least as
It is good like that by means of the scanning of the test pattern of pre-determining in hectographic printing, and when not needing be additional for color measuring
Between spend.
In the example with 5 curves shown, by means of identical curve for all in the simplest use
Color Channel only print page 5 in CMYK printing process, wherein one page includes best test pattern.When all channels
It when changing independently of one another, however does not print 5^4=625 pages in line with the purpose then, equally prints as above first only
Only page 5 and new test pattern is then generated by software immediately by means of the combination being most preferably distorted in single channel,
The new test pattern is subsequently printed.
It is limited it is possible that each color space is more than total volume in terms of the summation of its print color share.Work as test
When pattern is not to stack placement largely, then this can be tolerated.It alternatively, can also be by all this colors in test pattern
Space is left white or limits in this way, so that no longer violating the limitation.
Here, the specific preferred configuration of one of the method is distributed from the mesh point being calibrated to test pattern
The reversible use calculated.Here, by the measurement data of calibration directly in view of in the distribution of test pattern.
Therefore the optimal mesh point calculated for characteristic file is obtained.So as in the machine based on volume calibrated
Upper characteristic file of the generation based on volume.Possible curve group is the curve group that SCTV is calculated.
Optimal one-dimensional distribution can also be iteratively determined in an other preferred configuration of the method, it is described
One-dimensional distribution can also realize the optimal multiple dimensional distribution for measuring pattern block.
Here, test pattern for having decisive significance according to the method for the present invention.When by means of the print based on volume
When brush system prints suitable test pattern, then ICC characteristic files 11 are it is possible thereby to be similar to that used in hectographic printing
Sample calculates.
Test pattern in the relevant page of device by comprising color space in be single with each pixel picoliters
The combination of the print color share of position characterizes.The value generated in single situation herein on the one hand with each Color Channel or
The maximum allowable amount of color of printing equipment is related, on the other hand related to the predistortion 8 used respectively.When the survey in such as CMYK
When attempting case by being exported according to the test pattern of ISO 12647-2, which is placed in the grid of rule on process space,
The test pattern then changed equally has well-regulated grid, only has following differences, that is, substitutes percentage value now with each picture
Plain 10 picoliters 9 occur and the classification in different channels can also be different.It is also generated in hectographic printing in principle
The test pattern, that is to say, that when calibration and characterization should be jointly by means of printing plate come when determining.Here, by change curve
The calibration curve that gradient determines reversibly uses in the print color share of the test pattern of initial pre-determining.
Therefore, maximum area in units of percentage is covered in characteristic file calculating as in hectographic printing
Lid summation TAC is considered as limiting, it now is possible to consider the total of the print color share as unit of 10 picoliters 9 of each pixel
With.
The test pattern of printing with the measurement that is carried out with colour measurement method exactly as in hectographic printing to test chart
The measurement of case carries out like that.It only has to substitute and commonly be added with each pixel as the percentage value of print color share
10 picoliters 9 are the currently used value of unit.
The ICC characteristic files calculated by test pattern substantially indicate the separation of such as Lab to CMYK and for for example
Transformation needed for the simulation of CMYK to Lab.The area in the case of ink jet printing based on volume with hectographic printing characteristic file
It is not, is generated by as unit of 10 picoliters 9 of each pixel in the specific page of device, i.e. in the CMYK of process color space
Value, the value are matched by means of suitable scaling factor and the region of the permission for Color Channel when necessary, are similar in PDF
In data when necessary needed for calibration, the calibration it is stated that.
Reference numerals list
1 continuous glassware
2 printed substrates
3 dischargers
4 ink-jet printing apparatus
5 ink jet printing heads
6 computers
7 ink-jet printers
Scheduled, predistortion the curve of 8 input value as unit of pL/P
Color value of 9 x-axis-as unit of pL
The pixel of 10 y-axis-selection
11 ICC characteristic files.
Claims (10)
1. one kind is for passing through computer (6) by means of the color notation conversion space between targeted colorspace and process color space
And the method that printing process is carried out in ink-jet printer (7), wherein in order to calibrate the ink-jet printer (7), be suitable for institute
The test pattern of printing process is stated with being printed depending on being limited in process color space for printing process in applying in color
It brushes and to be measured in targeted colorspace with colour measurement method, the measured value so generated is corresponded to measured
Mesh point in targeted colorspace pushes away and thereby determines that other mesh point between the mesh point in progress, and
By means of in the targeted colorspace mesh point and in the process color space known to test pattern it is defeated
Entering value and carries out color notation conversion space, the input value corresponds to the mesh point in the targeted colorspace,
It is characterized in that,
For the color application in depending on the limitation of printing process and for defeated in the process color space
Enter value directly use droplet volume (9,10) physics size, the calibration of the ink-jet printer adjust as follows and thus into
The row printing process.
2. according to the method described in claim 1, it is characterized in that, the targeted colorspace is Lab color spaces, and institute
Stating process color space is CMYK color space or includes process color space of the CMYK color space as subset.
3. according to any method of the preceding claims, which is characterized in that calibrating the ink-jet printer (7)
When, the mesh point of the Color Channel for each using evenly distributedly is calculated and based on progress, computer assisted
Color notation conversion space generates alignment features curve and uses the alignment features for the printing process of the ink-jet printer (7)
Curve.
4. according to the method described in claim 3, it is characterized in that, the mesh point of each Color Channel is uniformly distributed by borrowing
Help at least two scheduled curves (8) of the input value (9,10) with the predistortion for each Color Channel in process face
The input value based on ink droplet is handled in the colour space to realize, wherein printing one for each scheduled curve (8) has accordingly
Predistortion input value (9,10) test pattern and then using with generate optimal measured value test pattern make
For the test pattern suitable for color notation conversion space.
5. according to the method described in claim 4, it is characterized in that, when input value (9,10) are distorted, the distortion is for institute
Some Color Channels carry out independently of one another, firstly for a Color Channel in described at least two scheduled curves (8)
Each of scheduled curve print a test pattern with the correspondingly input value (9,10) of predistortion, then pass through described
All remaining combinations of the computer for the input value (9,10) of other Color Channel analog predistortion, and thus use
The test pattern of optimal test zone generating, suitable, with all colours channel is used for color notation conversion space.
6. method according to any one of claim 3 to 5, which is characterized in that iteratively along the target of multidimensional and mistake
One-dimensional axis in journey color space determines being uniformly distributed for the mesh point of each Color Channel, is achieved in suitable test chart
The multidimensional of the test zone of case is uniformly distributed.
7. according to any method of the preceding claims, which is characterized in that depended in color application
Being limited in for printing process determines in the range of characterization, in the characterization, droplet volume to maximum color application value
Limitation is carried out by means of the physics predetermined value of the drying property about ink, thus generates the conditional test zone of tool, conjunction
Suitable, modified test pattern, which also includes only can be by the ink-jet printer (7) in the process face
The test zone printed in the colour space, the test zone are within maximum color application value.
8. the method according to the description of claim 7 is characterized in that in order to generate the conditional test zone of tool, it is suitable,
Modified test pattern, the test zone other than maximum color application value are modified to maximum color application value, no
It is printed or printed and be then ignored.
9. the method according to any one of preceding claims 7 to 8, which is characterized in that by means of the mesh point determined
It is generated in targeted colorspace and process with the conditional test zone of tool, suitable, modified test pattern
The ICC characteristic files (11) of color notation conversion space between color space are to carry out printing process.
10. according to any method of the preceding claims, which is characterized in that the calibration is about in test pattern
Mesh point distribution calculating reversibly carry out, wherein by the measurement data of the calibration directly consider the test pattern
Test zone distribution in.
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| DE102017204779.8 | 2017-03-22 |
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| US (1) | US10397413B2 (en) |
| JP (1) | JP2018160895A (en) |
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| Publication number | Publication date |
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| DE102018202453A1 (en) | 2018-09-27 |
| JP2018160895A (en) | 2018-10-11 |
| US10397413B2 (en) | 2019-08-27 |
| CN108621567B (en) | 2021-02-19 |
| US20180278758A1 (en) | 2018-09-27 |
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